Marshall has a 400-290 overall record in 17 seasons leading the Grizzlies. He has led the baseball program to three Heartland Collegiate Athletic Conference titles, and has been named the league's Coach of the Year three times.

Franklin made its first NCAA Division III regional appearance in 2011, and earned its highest national ranking, No. 21, in the American Baseball Coaches Association/Collegiate Baseball poll during the 2009 season.

Marshall has also led the Grizzlies to two victories over NCAA Division I opponents, defeating the University of Notre Dame in 2007 and Butler University in 2009.